PDF(Pubmed)
Abstract：
The realm of diazinon reduction from polluted water has witnessed a surge in the significance of advanced oxidation processes (AOPs) in recent times. However, there is a dearth of research focusing on the mitigation of its toxicity through AOPs. Thus, the primary objective of this study was to evaluate the effectiveness of the Electro-Fenton process (EFP) in the eradication and detoxification of diazinon in aqueous solutions. Synthetic wastewater samples with concentrations of 2, 2.5 and 3 mg/L were prepared. A total of 27 samples were determined using Box Behnken Design. Reaction time, pH and iron to hydrogen peroxide ratio (Fe2+/H2O2) were examined as operational parameters under a constant current of 5.4 amps. The quantification of diazinon concentration was performed using High-Performance Liquid Chromatography (HPLC). To evaluate the detoxification of diazinon, the Daphnia magna bioassay was employed as a methodology in this study. According to the results, the EFP could reduce the diazinon to zero and the LC50 values are increased by applying the process. The LC50 values for diazinon were determined using the Daphnia magna bioassay, considering initial concentrations of 2, 2.5, and 3 mg/L at a pH of 5, a reaction time of 15 min, and an iron to hydrogen peroxide molar ratio of 2. The recorded LC50 values were 3.039, 3.076, and 3.106, respectively, indicating the lowest frequency of cumulative death in Daphnia magna. In this case, after 96 h, only 3 cases (30%) of Daphnia magna death were observed. However, for all the mentioned concentrations of diazinon, after 96 h of exposure to samples without applying the Daphnia Magna death process, it was observed between 60 and 100%. Reducing the diazinon concentration and increasing the 96-h LC50 showed that the EFP can reduce the toxicity of diazinon on Daphnia Magna at the same time. Therefore, EFP can be considered a superior method with low ecotoxicity.
摘要：
近年来，从污水中减少二嗪农的领域见证了高级氧化工艺（AOPs）的重要性激增。然而,缺乏通过AOPs减轻其毒性的研究。因此，这项研究的主要目的是评估电芬顿方法（EFP）在水溶液中根除和解毒二嗪农的有效性。制备了浓度为2、2.5和3mg/L的合成废水样品。使用BoxBehnken设计确定总共27个样品。反应时间,在5.4安培的恒定电流下检查pH和铁与过氧化氢的比率（Fe2/H2O2）作为操作参数。使用高效液相色谱(HPLC)进行二嗪农浓度的定量。为了评估二嗪农的排毒效果，本研究采用大型水蚤生物测定法。根据结果,EFP可以将二嗪农降低到零，并且通过应用该方法增加LC50值。二嗪农的LC50值是使用大型水蚤生物测定法测定的，考虑到初始浓度为2、2.5和3mg/L，pH为5，反应时间为15分钟，和铁与过氧化氢的摩尔比为2。记录的LC50值分别为3.039、3.076和3.106，表明大型水蚤的累积死亡频率最低。在这种情况下,96小时后，仅观察到3例（30％）大型水蚤死亡。然而,对于所有提到的浓度的二嗪农，在未应用大型水蚤死亡过程的情况下暴露于样品96小时后，在60％至100％之间观察到。降低二嗪农浓度和提高96hLC50表明，EFP可以同时降低二嗪农对大型蚤的毒性。因此,EFP可以被认为是具有低生态毒性的优越方法。
